id:A034954 - OEIS Search Results

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Odd triangular numbers with prime indices.

+0
3

3, 15, 91, 153, 435, 703, 861, 1431, 1891, 2701, 4005, 4753, 5151, 5995, 6441, 9453, 11175, 12403, 15051, 16471, 18721, 19503, 26335, 27261, 29161, 33153, 36315, 38503, 39621, 43071, 49141, 50403, 56953, 61075, 62481, 69751, 75855, 79003 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`For prime indices p such that p(p+1)/2 is 'odd' see A002313 (primes of form 4n+1).`
	LINKS	`Eric Weisstein's World of Mathematics, Triangular Number`
	CROSSREFS	`Cf. A014493, A034953, A034955.` `Sequence in context: A025748 A097188 A024339 this_sequence A077783 A047019 A099251` `Adjacent sequences: A034951 A034952 A034953 this_sequence A034955 A034956 A034957`
	KEYWORD	`nonn`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 1998.`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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